Glass works



1918, Serial in Drawin -L Original application filed May as, 1918 Specification of Letters Patent.

Patented June 3, 1919.

, Serial a... sauna. Divided and this application filed October 14, 1918; Serial Ho. 258,056.

To all whom it may concern:

Be it known'that we, HENRY PHELPS GAGE, a citizen of the United States of merica, and a resident of Corning, New York, and WILLIAM CHI'I'I'ENDEN 'TAYLOR, a citizen of the United States of America, and a resident of Corning, New York, have jointly invented certain new and useful Improvements in Glass, of which'the following is a specification.

Our invention relates to a lass which has high transmission for the u tra-violet rays while absorbing practically all of the visible light, and which is useful for certain purposes where such a glass is desirable. present application is filed in response to a requirement of the Patent Office as a division of our rior application filed May 28,

0. 237,108, for glass.

In making our improved glass, we make use of our discovery that oxid of nickel (NiO) when melted in a suitable batch in proportions of from to If, however, certain ingredients are present in the glass in substantial proportions, the desired results are not obtained to the highest extent. Among the undesirable ingredients are lime, ma esia, lead oxid, alumina, and boric acid. ither soda or potash can be used as the alkali, while, in the present instance, zinc oxid is usedas the base.

The

12 per cent. of the total, gives a glass having the properties desired.

l "The following are compositions of zinc oxid glass illustrative of this invention:-

S10, 53.0% 60.0% 60.0% as. 0 K 0 29.0 22.5 Na,0 13.8 15.5 ZnO 15.0 17.0 14.2 16.0

It will be noted that as shown by thr a considerable variation in of nickel 1s glasses containing above formula, the percentage being understood that small amounts of nickel transmit extreme red and infra-red, as Well as ultra-violet, but glasses high in nickel transmit only ultraviolet. The amount of infra-red transmitted varies therefore with the amount oi nickel and the thickness of the glass.

Having thus described our invention, we claim 1. A zinc glass containing from to 12% nickel oxid.

2. A glass composed of potassium-zincsilicate colored with oxid of nickel.

3. A glass essentially consisting of an alkali-zinc-silicate colored with oxid of nickel.

In testimony whereof, we have hereunto set our hands this 12th day of October 1918.

HENRY PHELPS GAGE. WILLIAM CHI 'ITENDEN TAYLOR.

permissible, it 

